THYMIC CYST APPEARING AFTER TREATMENT OF MEDIASTINAL NON-HODGKIN-LYMPHOMA

We report the first case of a thymic cyst appearing in the course of t reatment for non-Hodgkin lymphoma of the anterior me diastinum. The pa tient was a 9-year-old child in whom an abnormal contour of the left c ardiac border persisted after chemotherapy, suggesting residual diseas e. The mass was found at thoracotomy to be a benign thymic cyst. The l esion was not present 2 years previously, and most likely represented cystic degeneration of the thymus, secondary to lymphomatous involveme nt. CT scan was not helpful in distinguishing the cystic lesion from r esidual lymphoma. (C) 1994 Wiley-Liss, Inc.